Comment by mamcx

I also work on this area (https://tablam.org) and have used languages where this weird, poorly developed language SQL was not the main interface (FoxPro).

Think on this: You imagine yourself writing a regular website with ONLy sql? no, because SQL is not a "programming language" for developers.

Is possible you could think in various ideas about why is "nonsensical" to make an app with a relational language (that SQL clearly is not) but is the same as with OOP or functional: there is not reason to be a problem, and there is a lot of things that will be far easier if a proper relational language is used, like for example, is unnecessary and ORM and/or is not complicated and confusing to make one.